Three-Position Disconnector Switch With Radial Contact Layout
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional three-position disconnector switches face challenges in achieving sufficient dielectric insulation while maintaining a compact size, leading to increased costs and size constraints.
Innovation Solution
The design incorporates a fork-type double middle or power out contact, allowing for longer air gaps within the same overall dimensions, thereby enhancing dielectric limits without increasing the switch's size or cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the dielectric insulation level is increased by extending air gaps between contacts, then the dielectric performance is improved, but the overall length of the disconnector switch increases threefold
Solution Approach 1:
The patent transitions from a linear arrangement of contacts to a radial configuration where contacts are arranged around a central piston. This dimensional change allows the air gaps to extend radially outward from the piston center, achieving increased dielectric insulation without proportionally increasing the overall device length. The movable contact (piston) remains centrally positioned while fixed contacts are distributed radially, creating effective insulation paths in multiple directions simultaneously.
Solution Approach 2:
The design places the movable piston contact inside a housing that contains the fixed contacts arranged radially around it. This nested configuration allows the air gaps to extend from the central piston to the surrounding fixed contacts, maximizing the insulation distance within a compact cylindrical volume. The radial arrangement enables the air gaps to be effectively nested within the housing structure rather than extending linearly outward.
2Reliability
If the air gaps between movable contact and side fixed contacts are increased to increase dielectric insulation level, then the dielectric performance is improved, but the cost and total size increase
Solution Approach 1:
The patent employs a radial configuration where fixed contacts are arranged around the central movable piston at different angular positions. This allows air gaps to extend in multiple radial directions simultaneously, achieving comprehensive dielectric insulation coverage without proportionally increasing the device volume. The radial arrangement optimizes the use of available space within the cylindrical housing, creating effective insulation paths in all necessary directions within a compact footprint.
Solution Approach 2:
The central piston serves multiple functions: it acts as the movable contact that connects different fixed contacts, provides the central reference point for radial air gap distribution, and maintains consistent positioning relative to all surrounding fixed contacts. This multi-functional design eliminates the need for separate insulation structures for each contact pair, reducing overall device size while maintaining adequate dielectric insulation levels across all contact interfaces.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration provides increased dielectric insulation performance, reduces the overall size of the disconnector switch, and lowers production costs by optimizing the distribution of material and incorporating cooling features.
Implementation Method 1
The piston is configured to move along an axis of the three-position disconnector switch to transition the three-position disconnector switch between the different switch positions
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present invention relates to a three-position disconnector switch, comprising:an earthing contact (1); a power out contact (2); a power in contact (3); and a piston (4). The power out contact comprises a first part (2a) and a second part (2b), and wherein the first part is connected to the second part by a leg portion (2c). In a first switch position an outer surface of a wall of the piston makes a direct electrical contact with the first part of the power out contact and makes a direct electrical contact with the power in contact. In a second switch position the outer surface of the wall of the piston makes a direct electrical contact with the first part of the power out contact and makes a direct electrical contact with the second part of the power out contact. In a third switch position the outer surface of wall of the piston makes a direct electrical contact with the second part of the power out contact and makes a direct electrical contact with the earthing contact. The piston is configured to move along an axis of the three-position disconnector switch to transition the three-position disconnector switch between the different switch positions